Steam-actuated valve for engines



(No Model.) 2 Shetats-Shet 1;

- A; A. NANNEY. STEAM AGTUATED VALVE FOR ENGINES.

No. 471,882. Patente-d'M ar. 2.9, 1892.

. j z za s armi X6 703%W29Z m TERB o0. FHDTO'UTHOH-WASHINGTON, n. c.

DR SFE (No Model.-) 2 Sheets-Sheet 2.

A. A. NANNEY. I STEAM AUTUATED VALVE FOR ENGINES.

Patented Mar. 29, 1892.

f6 )egx m,

UNITED STATES ATENT FEFICE.

STEAM-ACTUATED VALVE FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 471,882, dated March29, 1892.

Application filed November 20, 1891. Serial No. 412,512. (No model.)

To all whom it may concern.-

Be it known that I, ADDISON A. NANNEY, a citizen of the United States,residing at Evansville, in the county of Vanderburgh and State ofIndiana, have invented certain new and useful Improvements inSteam-Actuated Valves for Engines; and I do hereby declare that thefollowing is afull, clear, and exact description of the same, referencebeing had to the annexed drawings, making a part of this specification,and to the letters of reference marked thereon.

Figure 1 of the drawings represents alongitudinal section of my improvedsteam-actuated valve for engines, showing the several connectionsthereto and the main cylinder and piston. Fig. 2 represents an end viewof the valve-chest and part of the main cylinder. Fig. 3 represents asectional view taken on line 2 z of Fig. 1.

The present invention has relation to that class of valves which areoperated by steampressure and are controlled by the piston in the maincylinder, also to a valve that has unequal areas, upon which the steampresses, whereby the valve is operated by equalizing and removing thepressure from the opposite side of the piston of greater area.

The invention consists in the several details of constructions,substantially as shown in the drawings and "hereinafter described andclaimed.

In theaccompanying drawings, A represents the main cylinder, and. B thepiston thereof, the heads of the cylinder being represented at O D. Uponone side of the cylinder is the steam-chest E, which contains the valveand which is composed of the small piston F and the large pistons GH.The valveseats a are made separate from the steamchest, so that they maybe easily renewed when worn, and are cylindrical, said seats beingplaced in the chest and resting against the flanges b, and are held inposition by the cap-nuts a. Each seat is. provided with exhaust-ports d,leading to the atmosphere, and also exhaust-ports 6, leading from thecylinder to the valve-chest, the seat being also provided withsteam-ports f, which lead from the valve-chest to the passages g fromeither end of the cylinder. The heads 0 D of the main cylinder areprovided, respectively, with a valve-chest, (shown at k1,) which containthe puppet-valves I, and which are alternately opened by the piston Bduring the stroke of the same. From the steam-chest E leads asteam-passage it into the valve-chest h, as shown in dotted lines ofFig. 1, and the valvechests h t' communicate by means of the passage Z,and a second passage m extends therefrom and communicates with thesteam-chest E above the piston H, and in the valve-chest '6 under thevalve I and which communicates therewith is a passage 17, said passageleading to the atmosphere, as shown in dotted lines, Fig. 2.

The operation is as follows The position of the parts being as shown inFig. 1, it will be seen that the piston B has nearly reached the end ofthe stroke and opened the valve I in the valve-chest h, which openscommunication between the steam-chest E through the passages Zc Z at theback of the piston H. The pressure of steam on the piston G is nowcounterbalanced and the pressure on piston F moves it and openstheeXhaust-port e in the upper end of the cylinder and closing the lowerexhaust-port e and opening the steamport fin the lower end of thecylinder. This causes the steam to enter the cylinder under the pistonand move it to the top thereof, where it strikes the valve-stem andopens valve I in the valve-chest 'L', the valve I in the valve-chesthbeing now closed, which will exhaust the steam from behind the piston Hthrough the passages Z m nand from the latter to the atmosphere, thusdestroying the equilibrium of the pressure upon the pistons GH.

The pressure being greater on'piston G than.

on the piston F, the valve will move up and assume the position shown inFig. 1. It will be noticed that the exhaust-passages d at the upper endof the cylinder are between the two pistons G H, so that there is anequilibrium upon the exhaust as well as the steam side of the pistons.It should be noticed that the steam in the chest E causes the valve toremain in the upper end of the valve-chest, owing to the unequal area ofthe pistons'F Gqbut when through the operation otthe puppet-valves bymeans of the piston steam is let into the valve-chest behind the pistonH an equilibrium between the piston G H is established and the piston Fmoves the valve.

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent, is

1. In a steam-actuated valve, the combination of a valve composed ofthree pistons, two of which have greater area than the third, avalve-chest having exhaust-ports for one end of the cylinder between thepistons of greater area, and separate steam and exhaust ports to themain cylinder controlled by the said valve, substantially as and for thepurpose described.

2. In a steam-actuated valve, the combination of a Valve composed'ofthree pistons, two of which are of greater area than the third, avalve-chest having exhaust-ports between the pistons of greater area,separate steam and exhaust ports to the main cylinder, asteam andexhaust passage, and-puppet-valves operated bythe main piston forcontrolling said passage, substantially as and for the purposedescribed.

3. In a steam-actuated valve, the combination of the valve composed ofthree pistons,

ADDISON A. NANNEY;

Witnesses:

WM. FRANOKE, H. W. LAUER.

